Elevator



s p 1929- L. KREUTZKAMP ELEVATOR g'mnmto'c L.KreuZzkam a Sept. 10, 1929. L. KREUTZKAMP ELEVATOR Filed Oct. 26, 1928 s Sheets-Sheet 2 Sept. 10, 1929. 1.. KREUTZKAMP ELEVATOR Filed Oct. 26, 1928 3 Sheets-$heet I5 Suva W500 L.Kreuizl'anyn $351; 72121 abtmutj Z Patented Sept. 10, 1929. Q I

UNITED STATES PATENT OFFICE.

LOUIS KREUTZKAMIP, F MASPETH, NEW YORK.

ELEVATOR.

Application filed. October 26, 1928. Serial No. 315,218.

The main object of this invention is to pro which are located centrally on opposing walls vide an elevator which is novel'in construcin an elevator well in a building or under like tion in so far as it uses a screw to lift or lower conditions. These T-shaped rails serve as a a freight or passenger elevator car. guide and are engaged by guide brackets 12.

Another object of this invention is to pro The guide brackets are securely mounted upon vide an elevator which uses a screw for lifting the roof 13 or upon the floor, as is desired. In

or lowering the car of the same, the screw the type of elevator illustrated in Figures 1 being rotated by a worm drive. and 2 a spindle l-l is provided (having elec- Still another object of this invention is to trical acme threads) and this spindle passes provide an elevator which uses screw for centrally upwardly in the well. The upper 60 lifting and lowering the car, said screw being and lower ends of the spindle are relieved as so constructed as to automatically become disindicated by the numeral a pre-determined engaged from the car at the extreme upper distance. Near the extreme lower end a and lower positions of travel. worm gear 16 is attached to the spindle and .5 A. further object of this invention is to prothe projecting portion of the spindle, extendvide an elevator which uses a screw for pro- 'ing below the worm gear, is journaled in the pulsion means and is so constructed that variaperture of a thrust bearing 17. The worm ous modified positions of the screw is possible, gear is adapted to be rigidly secured to the that is, the screw may pass through the car in spindle and is engaged by a worm 18.

20 the center, at all the corners, at opposing posi- The relieved portion 15 of the spindle tions on the car, or at diagonal corners. has a coil spring 19 wound about it which i The above and other objects will become aphas suthcient tension to lift the weight of the parent in the description below, in which car 13 with or without passengers or freight.

characters of reference refer to like-named A cylinder 20, which is rigidly mounted. in

parts in the drawing. the car, receives the spindle therein. This Referring briefly to the drawing, Figure 1 cylinder is relieved throughout the greater is a top plan view of an elevator equipped portion of its length but, at its lower end,

with a lifting screw which is located at and is provided with threads which extend longipasses through the center of the car. tudinally in the cylinder a somewhat shorter 30 Figure 2 is a longitudinal sectional elevadistance than the length of the relieved por- 3O tional. view of Figure 1. p 7 tion 15. A means of control 21 may be 10- Figure 3 is a longitudinal sectional elevacated in the car for causing the worm to be tional view of a sidewalkelevator. actuated by the operator in the car or to dis- Figure lvis a top plan view of the same. engage the same from the same location.

Figure 5 is a top plan view of an elevator Figures 3 and 4 illustrate an elevator decar, showing the lifting screws located at opvice in which the screw travels with the car, posing positions in the well. is stationary, but is of the same principle.

Figure 6 is a fragmentary sectional eleva- These Figures 3 and 4 illustrate the common tional view of a car, showingthe mechanism type of sidewalk lift which raises freight or to used in the construction illustrated in Figpassengers, at a slow speed, from a sub-cellar are 5. to the sidewalk. This type of device is also Figure 7 is a top plan view of the lifting provided with T-shaped rails 22 and 23 which barrel of one of the modified forms of device, guide a platform or carrier 24:. Secured to used when screws are diagonally placed in a the underside of this platform is an anchor l5 well. bracket 25 which has a spindle 26 rigidly se- 5 Figure 8 is a sectional elevational view of cured thereto. The spindle is located centhesame. trally of the platform and depends there- Re g, th from and is relieved at its upper end 27.- A

if! a sir il l? c structioti. is resorted t' as prer. ice

at can is; a ssh wound about the relieved portion 27 and is adapted to lift the platform and spindle when said platform and spindle are at the lower end of the well 29 and seated upon a beveled gear 30 which is actuated by a beveled pinion 31.

Figures 5 and 6 illustrate a modification of the previously described types of elevator devices. In this type, illustrated in Figures 5 and 6', the spindle 32 is also provided with acme threads throughout the greater portion of its length. In this illustration, however, the spindle is supported at intermediate po sitions in bearing brackets 33 which are secured to the surface of the well in which the elevator islocated. Figure 6 illustrates the lower end of the spindle 32 and its upper end. The lower end of the spindle is relieved as indicated by the numeral 34 and has a coil spring 35 wound about the relieved portion which seats upon the worm gear 36, which actuates the spindle and is rigidly secured thereto. Near the'upper end of the spindle a second relieved portion 37, similar to the relieved portion 34, is provided so that when a floating threaded barrel 38 arrives at the upper or lower ends of travel on the spindle, the threads will be released and will not lift or lower the car, accordingly as the case may be. In this type of device the raised relieved portion at the upper end. of the spindle 32 hasa portion of the spindle of similar dimensions to the outside periphery of the screw continuing upwardly therefrom. This portion 39 is adapted to serve as a guidefor a sleeve 40. It is to be noted that both the sleeve 40 and barrel 38 areslotted longitudinally in order to pass the bearing brackets 33, as indicated in Figures 5 and 7. Figures 7 and 8 indicate a barrel which is slotted at 41 in a longitudinal direction, is threaded throughout its length, and is provided with a barrel 42, and is also provided with a mounting flange 43 which may be suitably secured to the roof or floor of the elevator car. The bearing bracket and barrel illustrated in these two views are adapted to engage each other at diagonally opposite positions in a well. The split bearing bracket, consisting of elements 44 and 45, are bolted to a tongue 46 which is mounted upon an L- shaped rail 47 at diagonally opposing corners in a well.

All of the types of elevators illustrated in the views operate under the same principle but have slight modifications to distinguish one from the other. In the elevator illustrated in Figures 1 and 2, a single screw, centrally mounted in the well, is used, and this screw passes through a cylinder 20 located in the car which is relieved throughout the greater portion of its length but is threaded at the lower end a distance less than the relieved portion 15 at the upper and lower 1 ends of the spindle 14. As the threaded portion of the cylinder is lowered beyond a position where the relieved portion 15 begins, the lifting and lowering spindle is thereafter completely disengaged from the spindle and no further rotation in the same direction in which the spindle moves will lower the car any farther. Consequently, through this construction, fault-y operation will not damage the parts constituting the elevator. Should the rotation of the spindle, however, be reversed, the spring 19, upon which the car seats at the extreme lower level of the movement of the car, will lift said car and cylinder 20 so that the threads in said cylinder will again engage the threads of the spindle and cause the car to be raised to its upper level.

The device illustrated in Figures 3 and 4 operates in the same manner as that previ ously described, but in this case the spindle 26 is not rotatable, but is rigidly mounted with the platform or carrier 24 and passes through a rotatable beveled gear 30 having a threaded aperture therein.

In the device illustrated in Figures 5 and 6 the elevator construction dispenses with the use of the T-shaped rails which are required in an elevator where a single worm is used. In Figure 6 the threaded barrel 38 engages on the screw and becomes disengaged at the upper and lower limits of its travel by riding upon the relieved portions 34 and 37 Mounted on the car and also rigid with the same are sleeves 40 which are slidably mounted on the spindle and do not engage the same. The barrel 38 has an ear 49 which is mounted on studs 50, and on opposite surfaces of this ear springs 48 are seated which tend to give a cushion effect to the travel of the car as it comes to an abrupt stop, either in raising or lowering.

It is to be noted that certain changes in form and construction may be made without departing from the spirit and scope of the invention.

I claim:

1. In an elevator, a car, a threaded spindle engaging said car, a cylinder mounted on said car having said spindle passing therethrough, threads in said cylinder, said spindle having a reduced diameter at the upper and lower ends thereof, the length of said reduced diameter being greater than the length of threads in said cylinder, and means for urging the threads in said cylinder into engagement with the threads of said spindle when said car is at the lower limits of its travel.

2. In an elevator, a car, a threaded spindle engaging said car, a cylinder mounted on said car having said spindle passing therethrough, threads in said cylinder, said spindle having a reduced diameter at the upper and lower ends thereof, the length of said reduced diameter being greater than the length of threads in said cylinder, and yieldable means adapted to lift said car into en gagement with the threads of said spindle when said car is at the lower limits of its travel.

3. In an elevator, a car, a threaded spindle engaging said car, a cylinder mounted on said car having said spindle passing therethrough, threads in said cylinder, said spindle having a reduced diameter at the upper and lower ends thereof, the length of said reduced diameter being greater than the length of threads in said cylinder, a coil spring mounted at the lower end of said spindle, said coil spring be ing adapted to have said cylinder in said car seated thereon and urge said cylinder and car upwardly into position Where the threads in said cylinder engage the threads of said spindle.

4. In an elevator, a car, a threaded spindle engaging said car, a cylinder mounted on said car having said spindle passing therethrough, threads in said cylinder, said spindle having a reduced diameter at the upper and lower ends thereof, the length of said re duced diameter being greater than the length of threads in said cylinder, a coil spring mounted at the lower end of said spindle, said coil spring being adapted to have said cylinder in said car seated thereon and urge said cylinder and car upwardly into position where the threads in said cylinder engage the threads of said spindle, and a split sleeve mounted on said car adapted to serve as a guide for said car.

In testimony whereof I afiix my signature.

LOUIS KREUTZKAMP. 

